Philips
Semiconductors
74F1240
Octal inverter buffer (3-State)
74F1241
Octal buffer (3-State)*
Product specification
Supercedes data of 1989 Apr 04
IC15 Data Handbook
1999 Jan 08
INTEGRATED CIRCUITS
* Discontinued part. Please see the Discontinued Product List.
Philips Semiconductors
Product specification
74F1240, 74F1241*
Buffers
74F1240
Octal inverter buffer (3-State)
2
1999 Jan 08
8530039 20619
* Discontinued part. Please see the Discontinued Products List.
FEATURES
High impedance NPN base inputs for reduced loading
(20
A in High and Low states)
Low power, light loading
Functional pin-for-pin equivalent of 74F240 and 74F241
1/30th the bus loading of 74F240 and 74F241
Provides ideal interface and increase fan-out of MOS
microprocessors
Octal bus interface
3-State buffer outputs sink 64mA
15mA source current
DESCRIPTION
The 74F1240 and 74F1241 are octal buffers that are ideal for driving
bus lines or buffer memory address registers. The outputs are
capable of sinking 64mA and sourcing up to 15mA, producing very
good capacitive drive characteristics. The device features two
Output Enables, OEa and OEb, each controlling four of the 3-State
outputs.
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F1240
3.5ns
40mA
74F1241
4.5ns
46mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
10%,
T
amb
= 0
C to +70
C
DRAWING
NUMBER
20-pin plastic DIP
N74F1240N
SOT146-1
20-pin plastic SOL
N74F1240D
SOT163-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS
DESCRIPTION
74F (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
Ian, Ibn
Data inputs
1.0/0.033
20
A/20
A
OEa, OEb
Output enable inputs (active Low)
1.0/0.033
20
A/20
A
OEb
Output enable input (active High, 74F1241)
1.0/0.033
20
A/20
A
Yan, Ybn
Data outputs (74F1241)
750/106.7
15mA/64mA
Yan, Ybn
Data outputs (74F1240)
750/106.7
15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20
A in the High state and 0.6mA in the Low state.
Philips Semiconductors
Product specification
74F1240, 74F1241*
Buffers
1999 Jan 08
3
* Discontinued part. Please see the Discontinued Products List.
PIN CONFIGURATION 74F1240
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SF00320
OEa
Ia0
Yb0
Ia1
Yb1
Ia2
Yb2
Ia3
Yb3
GND
V
CC
OEb
Ya0
Ib0
Ya1
Ib1
Ya2
Ib2
Ya3
Ib3
PIN CONFIGURATION 74F1241
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SF00324
OEa
Ia0
Yb0
Ia1
Yb1
Ia2
Yb2
Ia3
Yb3
GND
V
CC
OEb
Ya0
Ib0
Ya1
Ya2
Ib2
Ya3
Ib3
Ib1
LOGIC SYMBOL 74F1240
V
CC
= Pin 20
GND = Pin 10
SF00321
1
19
OEa
OEb
2
4
6
8
17
15
13
11
18
16
14
12
3
5
7
9
Ia0
Ia1
Ia2
Ia3
Ib0
Ib1
Ib2 Ib3
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
LOGIC SYMBOL 74F1241
V
CC
= Pin 20
GND = Pin 10
SF00325
2
4
6
8
17
15
13
11
18
16
14
12
3
5
7
9
Ia0
Ia1 Ia2
Ia3 Ib0
Ib1 Ib2
Ib3
1
19
OEa
OEb
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
IEC/IEEE SYMBOL 74F1240
2
1
EN1
1
2
SF01367
19
4
6
8
17
15
13
11
EN2
9
7
5
3
12
14
16
18
IEC/IEEE SYMBOL 74F1241
2
1
EN1
1
2
SF01368
19
4
6
8
17
15
13
11
EN2
9
7
5
3
12
14
16
18
Philips Semiconductors
Product specification
74F1240, 74F1241*
Buffers
1999 Jan 08
4
* Discontinued part. Please see the Discontinued Products List.
LOGIC DIAGRAM 74F1240
Ia0
2
18
Ya0
Ia1
4
16
Ya1
Ia2
6
14
Ya2
Ia3
8
12
Ya3
OEa
1
Ib0
17
3
Yb0
Ib1
15
5
Yb1
Ib2
13
7
Yb2
Ib3
11
9
Yb3
OEb
19
SF01369
FUNCTION TABLE 74F1240
INPUTS
OUTPUTS
OEa
Ia
OEb
Ib
Ya
Yb
L
L
L
L
H
H
L
H
L
H
L
L
H
X
H
X
Z
Z
H = High voltage level
L
= Low voltage level
X = Don't care
Z = High impedance "off" state
LOGIC DIAGRAM 74F1241
Ia0
2
18
Ya0
Ia1
4
16
Ya1
Ia2
6
14
Ya2
Ia3
8
12
Ya3
OEa
1
Ib0
17
3
Yb0
Ib1
15
5
Yb1
Ib2
13
7
Yb2
Ib3
11
9
Yb3
OEb
19
SF01370
FUNCTION TABLE 74F1241
INPUTS
OUTPUTS
OEa
Ia
OEb
Ib
Ya
Yb
L
L
H
L
L
L
L
H
H
H
H
H
H
X
L
X
Z
Z
H = High voltage level
L
= Low voltage level
X = Don't care
Z = High impedance "off" state
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
PARAMETER
RATING
UNIT
V
CC
Supply voltage
0.5 to +7.0
V
V
IN
Input voltage
0.5 to +7.0
V
I
IN
Input current
30 to +5
mA
V
OUT
Voltage applied to output in High output state
0.5 to V
CC
V
I
OUT
Current applied to output in Low output state
128
mA
T
amb
Operating free-air temperature range
0 to +70
C
T
stg
Storage temperature range
65 to +150
C
Philips Semiconductors
Product specification
74F1240, 74F1241*
Buffers
1999 Jan 08
5
* Discontinued part. Please see the Discontinued Products List.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
MIN
NOM
MAX
UNIT
V
CC
Supply voltage
4.5
5.0
5.5
V
V
IH
High-level input voltage
2.0
V
V
IL
Low-level input voltage
0.8
V
I
IK
Input clamp current
18
mA
I
OH
High-level output current
15
mA
I
OL
Low-level output current
64
mA
T
amb
Operating free-air temperature range
0
+70
C
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST CONDITIONS
1
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN
TYP
MAX
UNIT
I
O
= 3mA
10% V
CC
2.4
V
V
O
High level output voltage
V
CC
= MIN
V
IL
= MAX
I
OH
= 3mA
5% V
CC
2.7
3.3
V
V
OH
High-level output voltage
V
IL
= MAX
V
IH
= MIN
I
O
= 15mA
10% V
CC
2.0
V
I
OH
= 15mA
5% V
CC
2.0
V
V
O
Low level output voltage
V
CC
= MIN
V
IL
= MAX
I
OL
= 48mA
10% V
CC
0.38
0.55
V
V
OL
Low-level output voltage
V
IL
= MAX
V
IH
= MIN
I
OL
= 64mA
5% V
CC
0.42
0.55
V
V
IK
Input clamp voltage
V
CC
= MIN, I
I
= I
IK
0.73
1.2
V
I
I
Input current at maximum input voltage
V
CC
= 0.0V, V
I
= 7.0V
100
A
I
IH
High-level input current
V
CC
= MAX, V
I
= 2.7V
20
A
I
IL
Low-level input current
V
CC
= MAX, V
I
= 0.5V
20
A
I
OZH
Off-state output current,
High-level voltage applied
V
CC
= MAX, V
O
= 2.7V
50
A
I
OZL
Off-state output current,
Low-level voltage applied
V
CC
= MAX, V
O
= 0.5V
50
A
I
OS
Short-circuit output current
3
V
CC
= MAX
100
225
mA
I
CCH
22
30
mA
74F1240
I
CCL
V
CC
= MAX
58
75
mA
I
CC
Supply current (total)
I
CCZ
44
58
mA
I
CC
Supply current (total)
I
CCH
33
44
mA
74F1241
I
CCL
V
CC
= MAX
62
80
mA
I
CCZ
45
60
mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25
C.
3. Not more than one output should be shorted at a time. For testing I
OS
, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I
OS
tests should be performed last.
Philips Semiconductors
Product specification
74F1240, 74F1241*
Buffers
1999 Jan 08
6
* Discontinued part. Please see the Discontinued Products List.
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST
CONDITION
T
amb
= +25
C
V
CC
= +5.0V
C
L
= 50pF, R
L
= 500
T
amb
= 0
C to +70
C
V
CC
= +5.0V
10%
C
L
= 50pF, R
L
= 500
UNIT
MIN
TYP
MAX
MIN
MAX
t
PLH
t
PHL
Propagation delay
Ian, Ibn, to Yn
Waveform 1
3.0
1.5
4.5
2.5
6.5
4.5
2.5
1.5
7.5
5.0
ns
ns
t
PZH
t
PZL
Output Enable time
to High or Low level
74F1240
Waveform 3
Waveform 4
3.0
4.0
5.5
7.0
7.5
9.0
3.0
4.0
8.0
9.5
ns
ns
t
PHZ
t
PLZ
Output Disable time
to High or Low level
Waveform 3
Waveform 4
2.0
2.0
4.0
4.0
6.0
5.5
2.0
2.0
6.5
6.0
ns
ns
t
PLH
t
PHL
Propagation delay
Ian, Ibn, to Yn
Waveform 2
2.5
2.5
4.0
5.0
5.5
6.5
2.5
2.5
6.0
7.0
ns
ns
t
PZH
t
PZL
Output Enable time
to High or Low level
74F1241
Waveform 3
Waveform 4
3.0
3.0
5.5
6.5
7.0
8.0
3.0
3.0
7.5
8.5
ns
ns
t
PHZ
t
PLZ
Output Disable time
to High or Low level
Waveform 3
Waveform 4
3.0
3.0
5.5
6.0
7.5
8.0
3.0
3.0
8.5
8.5
ns
ns
AC WAVEFORMS
For all waveforms, V
M
= 1.5V.
Ian, Ibn
V
M
V
M
V
M
V
M
t
PLH
t
PHL
Yn
SF00328
Waveform 1. For Inverting Outputs
Ian, Ibn
V
M
V
M
V
M
V
M
t
PHL
t
PLH
Yn
SF00329
Waveform 2. For Non-inverting Outputs
VM
VM
VM
tPHZ
tPZH
VOH -0.3V
0V
Yn, Yn
OEn
OEb
SF00330
Waveform 3. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
VM
VM
VM
tPLZ
tPZL
VOL +0.3V
3.5V
OEn
OEb
Yn, Yn
SF00331
Waveform 4. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
Philips Semiconductors
Product specification
74F1240, 74F1241*
Buffers
1999 Jan 08
7
* Discontinued part. Please see the Discontinued Products List.
TEST CIRCUIT AND WAVEFORMS
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0V
0V
tTHL (tf
)
INPUT PULSE REQUIREMENTS
rep. rate
t
w
t
TLH
t
THL
1MHz
500ns
2.5ns
2.5ns
Input Pulse Definition
VCC
family
74F
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test Circuit for Open Collector Outputs
DEFINITIONS:
R
L
= Load resistor;
see AC electrical characteristics for value.
C
L
= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
tTHL (tf
)
tTLH (tr
)
tTLH (tr
)
AMP (V)
amplitude
3.0V
1.5V
V
M
RL
7.0V
SF00128
TEST
SWITCH
t
PLZ
closed
t
PZL
closed
All other
open
SWITCH POSITION
Philips Semiconductors
Product specification
74F1240, 74F1241*
Buffers
1999 Jan 08
8
* Discontinued part. Please see the Discontinued Product List.
DIP20:
plastic dual in-line package; 20 leads (300 mil)
SOT146-1
Philips Semiconductors
Product specification
74F1240, 74F1241*
Buffers
1999 Jan 08
9
* Discontinued part. Please see the Discontinued Product List.
SO20:
plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
Philips Semiconductors
Product specification
74F1240, 74F1241*
Buffers
1999 Jan 08
10
* Discontinued part. Please see the Discontinued Product List.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one
or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.
Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 940883409
Telephone 800-234-7381
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
Date of release: 03-98
Document order number:
9397-750-05191
Philips
Semiconductors
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
[1]
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
Data sheet status
[1]
Please consult the most recently issued datasheet before initiating or completing a design.
* Discontinued part. Please see the Discontinued Product List in Section 1, page 21.
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